Water Jacket Gasket – Fits Johnson/Evinrude 40-60HP (Replaces OMC 315538)
Water Jacket Gasket – Fits Johnson/Evinrude 40-60HP (Replaces OMC 315538) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Jacket Gasket – Fits Johnson/Evinrude 40-60HP (Replaces OMC 3...
Product Details
This Water Jacket Gasket provides a vital seal for Johnson/Evinrude 40-60HP, 2-Stroke engines manufactured between 1980 and 1997. It is precisely engineered to fit between the cylinder head cover and the engine block, preventing coolant leaks and helping to maintain optimal engine operating temperatures.
This part serves as a direct interchange for several OEM and aftermarket part numbers, including Sierra 18-0941, GLM 34780, Mallory 9-60451, PWC Engine 505-11, and ProGasket 315538.
- Installs directly between the cylinder head cover and the engine block.
- Engineered to OEM quality standards for a dependable, leak-free seal.
- Designed for use in marine environments with gasoline engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| OMC | 315538 |
| Sierra | 18-0941 |
| GLM | 34780 |
| Mallory | 9-60451 |
| PWC Engine | 505-11 |
| ProGasket | 315538 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 40 | 2-Stroke | 1984–1997 | 315538 | |
| Johnson/Evinrude | Various | 45 | 2-Stroke | 1984–1992 | 315538 | |
| Johnson/Evinrude | Various | 48 | 2-Stroke | 1987–1997 | 315538 | |
| Johnson/Evinrude | Various | 50 | 2-Stroke | 1981–1997 | 315538 | |
| Johnson/Evinrude | Various | 55 | 2-Stroke | 1980–1997 | 315538 | |
| Johnson/Evinrude | Various | 60 | 2-Stroke | 1980–1985 | 315538 |
Technical Specs
- Product Type
- Water Jacket Gasket
- Installation
- Between cylinder head cover and block
- Fuel Type
- Compatible with gasoline engines
- Dimensions
- 13.0 cm × 10.0 cm × 0.13 cm
- Weight
- 45g (1.6 oz)
- Warranty
- Manufacturer warranty varies by brand
- Other Technical Attributes
- OEM quality replacement gasket
What’s in the Box
- 1 x Water Jacket Gasket (Replaces OMC 315538)
Installation Notes
- Ensure the engine is completely cool and the battery is disconnected.
- Drain the engine coolant to a level below the cylinder head to prevent spills.
- Carefully remove the cylinder head cover bolts and lift the cover off.
- Remove the old water jacket gasket. Use a plastic scraper to gently remove any gasket residue from the engine block and head cover surfaces.
- Ensure both mating surfaces are immaculately clean, dry, and free of old gasket material, oil, or debris.
- Position the new gasket correctly, aligning it with the bolt holes and coolant passages.
- Reinstall the cylinder head cover and tighten the bolts in the sequence and to the torque values specified in your engine’s service manual.
- Refill the cooling system with the recommended coolant and check carefully for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if my water jacket gasket is failing?
Common signs of a failed gasket include visible coolant leaks around the cylinder head area, engine overheating, or a milky, emulsified appearance in the engine oil, which indicates coolant has mixed with the oil.
Will this gasket fit my specific engine model?
This gasket is designed for Johnson/Evinrude 40-60 HP 2-stroke models within the specified year ranges. The most reliable way to confirm fitment is to check that your original part number is 315538 before ordering.
What is the difference between this aftermarket gasket and an OEM one?
This aftermarket part is manufactured to meet or exceed original equipment (OEM) specifications for material quality, dimensions, and performance. It offers a comparable, reliable seal at a more accessible price point.
Should I use sealant when installing this gasket?
Most modern gaskets of this type are designed for dry installation. Using sealant can sometimes interfere with a proper seal. Always consult your engine’s official service manual for specific recommendations.
How often should this gasket be replaced?
There is no fixed replacement interval. This gasket should be replaced any time the cylinder head cover is removed for service, or immediately if you detect signs of a leak or failure.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window for unused parts in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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